US11168913B2 - Control method and control device of air conditioner and air conditioner - Google Patents

Control method and control device of air conditioner and air conditioner Download PDF

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Publication number
US11168913B2
US11168913B2 US16/618,570 US201916618570A US11168913B2 US 11168913 B2 US11168913 B2 US 11168913B2 US 201916618570 A US201916618570 A US 201916618570A US 11168913 B2 US11168913 B2 US 11168913B2
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Prior art keywords
air conditioner
low
opening degree
expansion valve
electronic expansion
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US16/618,570
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US20200232669A1 (en
Inventor
Linxing REN
Yongfeng XU
Xihua Ma
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GD Midea Heating and Ventilating Equipment Co Ltd
Hefei Midea Heating and Ventilating Equipment Co Ltd
Original Assignee
GD Midea Heating and Ventilating Equipment Co Ltd
Hefei Midea Heating and Ventilating Equipment Co Ltd
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Assigned to GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD., HEFEI MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD. reassignment GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MA, XIHUA, REN, LINXING, XU, Yongfeng
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/0205—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric not using a model or a simulator of the controlled system
    • G05B13/021—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric not using a model or a simulator of the controlled system in which a variable is automatically adjusted to optimise the performance
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2614—HVAC, heating, ventillation, climate control

Definitions

  • the present disclosure relates to the technical field of air conditioning control, in particular to a control method of an air conditioner, a control device of the air conditioner and the air conditioner.
  • the multi-connection air conditioning system is generally matched with a plurality of indoor units to operate.
  • the opening degree of the electronic expansion valve of the indoor unit is too low, low pressure is caused to be too low, and thus the outdoor unit mistakenly triggers low pressure protection to cause fault shutdown.
  • the air conditioning system is operated again after the fault is automatically recovered, and low pressure protection is caused to occur again for the same reason.
  • the air conditioning system is frequently started and stopped.
  • the air-conditioning system works in a low-temperature refrigeration mode, the frequency of the false shutdown phenomenon is particularly frequent, and the reliability of the air-conditioning system and the comfort of a user using the air conditioner are seriously affected.
  • the present disclosure aims to solve at least one of the technical problems in the related art to some extent.
  • the present disclosure provides in embodiments a control method of an air conditioner, which can effectively improve the reliability of the air conditioner and improve the comfort of a user in using the air conditioner.
  • the present disclosure also provides in embodiments a control device of an air conditioner and the air conditioner.
  • the control method comprises: when a starting capacity of the indoor unit is lower than or equal to a capacity threshold value and a low-voltage protection signal is received, adjusting an opening degree of an electronic expansion valve.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, so that the operating load of the air conditioner is lower, and the opening degree of the electronic expansion valve is lower.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, and a low-voltage protection signal of the outdoor unit of the air conditioner is received, the low-voltage protection signal has higher probability of false alarm caused by low operating load of the air conditioner and low opening degree of the electronic expansion valve, the air conditioner is not controlled to stop and remove obstacles, but the opening degree of the electronic expansion valve is adjusted.
  • the refrigerant further fills the pipeline.
  • the low pressure of the outdoor unit rises to be higher than the low-pressure protection threshold value, low-pressure faults are eliminated, the outdoor unit does not send low-pressure protection signals, and the air conditioner can resume normal operation.
  • the technical solution provided in embodiments of the present disclosure when the starting capacity of the indoor unit is low, the shutdown of the air conditioner caused by the false alarm of a low-voltage protection signal due to the fact that the operating load of the air conditioner is low and the opening degree of the electronic expansion valve is low can be avoided, the frequent false shutdown caused by the fact that the starting capacity of the indoor unit of the air conditioner is low is avoided, the reliability of the air conditioner can be effectively improved, and the comfort of a user for using the air conditioner is further improved.
  • the air conditioner when the air conditioner is started, whether the starting capacity of the indoor unit of the air conditioner is lower than or equal to a capacity threshold value is judged. If the starting capacity of the indoor unit is lower than or equal to the capacity threshold value, when a low-voltage protection signal of the outdoor unit is received, the electronic expansion valves of the indoor unit and the outdoor unit are controlled to increase the opening degree, the operating load of the air conditioner is increased, and the quantity of refrigerant passing through the electronic expansion valves is increased.
  • the low-voltage fault of the outdoor unit is eliminated, the outdoor unit does not send a low-voltage protection signal, the air conditioner is controlled to resume normal operation, frequent shutdown of the air conditioner due to false alarm of the low-voltage protection signal is avoided, and the reliability of the air conditioner and the comfortableness of a user for using the air conditioner are improved.
  • control method of an air conditioner provided in embodiments of the present disclosure can also have the following additional technical features: in the technical solution, preferably, the control method of an air conditioner further comprises: after the opening degree of the electronic expansion valve is adjusted, starting timing; when the timing reaches a first preset time length, if a low-voltage protection signal is still received, continuing timing; otherwise, controlling the first protection accumulation value to be increased by 1, and controlling the air conditioner to continue to operate.
  • the timing is started after the opening degree of the electronic expansion valve is adjusted, and whether the low-voltage fault of the outdoor unit is eliminated or not is judged after the timing reaches a first preset time length; if the low-voltage fault of the outdoor unit is not eliminated, namely the low-voltage protection signal is still received, timing is continued, and waiting is performed for the refrigerant to further enter the pipeline; if the low-voltage fault of the outdoor unit is eliminated, a low-voltage protection signal is not received any more, which indicates that the air conditioner can resume normal operation at the moment. 1 is added to the first protection accumulation value at the moment, the number of times that the fault takes a first preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • the method further comprises: when the timing reaches a second preset time length, if the low-voltage protection signal is still received, controlling the air conditioner to stop operating and sending out prompt information; otherwise, controlling the second protection accumulation value to be increased by 1, and controlling the air conditioner to continue to operate.
  • the opening degree of the electronic expansion valve is adjusted and the timing reaches a first preset time length, but the low-voltage fault of the outdoor unit is not eliminated, and the timing is continued and reaches a second preset time length, whether the low-voltage fault of the outdoor unit is eliminated or not is judged again. If the low-voltage protection signal is still received at the moment, the low-voltage fault is not false alarm caused by low starting capacity of the indoor unit, so the air conditioner needs to be controlled to stop operating and send out prompt information.
  • the user is prompted that the air conditioner has a fault, and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel for door maintenance at the first time; if the timing reaches the second preset time length, the low-voltage fault of the outdoor unit is eliminated, and the low-voltage protection signal is not received any more, which indicates that the air conditioner can resume normal operation at the moment. 1 is added to the second protection accumulation value at the moment, the number of times that the fault takes a second preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • the method further comprises: reducing operating frequency of outdoor unit.
  • the operating frequency of the outdoor unit of the air conditioner being higher, the corresponding pressure value in the normal pipe is higher.
  • the operating frequency of the outdoor unit is further reduced under the condition that a low-voltage fault is not eliminated after a first preset time length, the low-voltage fault can be recovered more quickly, and the air conditioner returns to normal operation more quickly.
  • control method further comprises: removing a correction value for the indoor unit; while the step of controlling the air conditioner to continue to operate is performed, the control method further comprises: restoring the correction value for indoor unit.
  • the correction value for the indoor unit aiming at sensor error values, such as an ambient temperature correction amount, an exhaust temperature correction amount, an evaporator outlet temperature correction amount and the like, and the correction amounts enable the operating frequency of the outdoor unit to be additionally increased in the original techniques so as to ensure that the temperature regulation effect of the air conditioner is consistent with user settings. Therefore, when the outdoor unit sends out a low-voltage protection signal, the correction value for the indoor unit is removed, so that the operating frequency of the outdoor unit returns to the original operating frequency, and the speed of low-voltage fault removal can be accelerated. Meanwhile, after the low-voltage fault is eliminated, while the step of controlling the air conditioner to continuously operate is performed, the correction value for the indoor unit is restored, so that the temperature regulation effect of the air conditioner is guaranteed.
  • sensor error values such as an ambient temperature correction amount, an exhaust temperature correction amount, an evaporator outlet temperature correction amount and the like
  • control method further comprises: continuously acquiring the first protection accumulation value and the second protection accumulation value in a third preset time length; the first protection accumulation value reaching a first protection threshold value, and/or the second protection accumulation value reaching a second protection threshold value, controlling the air conditioner to stop operating and sending out prompt information.
  • the first protection accumulation value and the second protection accumulation value are continuously acquired within a third preset time length, and when the first protection accumulation value reaches the first protection threshold value and/or the second protection accumulation value reaches the second protection threshold value, the air conditioner is indicated to have too many times of low-voltage faults in a short time, and low-voltage protection signals are not false alarms caused by low starting capacity of the indoor unit. Therefore, the air conditioner is controlled to stop operating, fault prompt information is sent to a user to prompt the user that the air conditioner has a fault and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel to go on door for maintenance at first time.
  • the step of adjusting the opening degree of the electronic expansion valve is as follows: adjusting an opening of the electronic expansion valve to an initial opening degree; or adjusting an opening of the electronic expansion valve to a maximum opening degree; or adjusting an opening of the electronic expansion valve to increase a preset opening degree.
  • the step of adjusting the opening degree of the electronic expansion valve specifically comprises adjusting the opening of the electronic expansion valve to an initial opening degree so as to enable the air conditioner to operate in an initial state; or adjusting the opening degree of the electronic expansion valve is specifically to adjust the opening of the electronic expansion valve to the maximum opening degree, so that low-pressure faults can be eliminated at the fastest speed; or the step of adjusting the opening degree of the electronic expansion valve specifically comprises adjusting the electronic expansion valve to increase the preset opening degree, so that low-pressure faults can be automatically eliminated according to the preset step.
  • the second aspect of the present disclosure provides in embodiments a control device for an air conditioner, the air conditioner comprising at least one indoor unit and one outdoor unit, the control device comprising: a memory and a processor; wherein the memory is used for storing a computer program; and the processor is configured to execute the computer program to: when the starting capacity of the indoor unit is lower than or equal to the capacity threshold value and a low-voltage protection signal is received, adjust the opening degree of the electronic expansion valve.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, so that the operating load of the air conditioner is lower, and the opening degree of the electronic expansion valve is lower.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, and a low-voltage protection signal of the outdoor unit of the air conditioner is received, the low-voltage protection signal has higher probability of false alarm caused by low operating load of the air conditioner and low opening degree of the electronic expansion valve.
  • the air conditioner is not controlled to stop and remove obstacles at the moment, but the opening degree of the electronic expansion valve is adjusted.
  • the refrigerant further fills the pipeline.
  • the low pressure of the outdoor unit rises to be higher than the low-pressure protection threshold value, low-pressure faults are eliminated, the outdoor unit does not send low-pressure protection signals, and the air conditioner can resume normal operation.
  • the technical solution provided in embodiments of the present disclosure when the starting capacity of the indoor unit is low, the shutdown of the air conditioner caused by the false alarm of a low-voltage protection signal due to the fact that the operating load of the air conditioner is low and the opening degree of the electronic expansion valve is low can be avoided, the frequent false shutdown caused by the fact that the starting capacity of the indoor unit of the air conditioner is lower, the reliability of the air conditioner can be effectively improved, and the comfort of a user for using the air conditioner is further improved.
  • the processor is further used for: after the opening degree of the electronic expansion valve is adjusted, starting timing; when the timing reaches a first preset time length, if a low-voltage protection signal is still received, continuing timing; otherwise, controlling the first protection accumulation value to be increased by 1, and controlling the air conditioner to continue to operate.
  • the timing is started after the opening degree of the electronic expansion valve is adjusted, and whether the low-voltage fault of the outdoor unit is eliminated or not is judged after the timing reaches a first preset time length; if the low-voltage fault of the outdoor unit is not eliminated, namely the low-voltage protection signal is still received, timing is continued, and waiting is performed for the refrigerant to further enter the pipeline; if the low-voltage fault of the outdoor unit is eliminated, a low-voltage protection signal is not received any more, which indicates that the air conditioner can resume normal operation at the moment. 1 is added to the first protection accumulation value at the moment, the number of times that the fault takes a first preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • the processor is preferably further used for: when the timing reaches a second preset time length, if the low-voltage protection signal is still received, controlling the air conditioner to stop operating and sending out prompt information; otherwise, controlling the second protection accumulation value to be increased by 1, and controlling the air conditioner to continue to operate.
  • the opening degree of the electronic expansion valve is adjusted and the timing reaches a first preset time length, but the low-voltage fault of the outdoor unit is not eliminated, and the timing is continued and reaches a second preset time length. Whether the low-voltage fault of the outdoor unit is eliminated or not is judged again. If the low-voltage protection signal is still received at the moment, the low-voltage fault is not false alarm caused by low starting capacity of the indoor unit, so the air conditioner needs to be controlled to stop operating and send out prompt information.
  • the user is prompted that the air conditioner has a fault, and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel for door maintenance at first time; if the timing reaches the second preset time length, the low-voltage fault of the outdoor unit is eliminated, the low-voltage protection signal is not received any more, the air conditioner can resume normal operation at the moment. 1 is added to the second protection accumulation value at the moment, the number of times that the fault takes a second preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • the processor is preferably further used for: reducing operating frequency of the outdoor unit.
  • the operating frequency of the outdoor unit of the air conditioner being higher, the corresponding pressure value in the normal pipe is higher, and the operating frequency of the outdoor unit is further reduced under the condition that a low-voltage fault is not eliminated after a first preset time length.
  • the low-voltage fault can be recovered more quickly, and the air conditioner returns to normal operation more quickly.
  • the processor is preferably further used for: while the step of adjusting the opening degree of the electronic expansion valve is performed, removing the correction value for the indoor unit; while the step of controlling the air conditioner to continue to operate is performed, restoring the correction value for indoor unit.
  • the correction value for indoor unit aiming at sensor error values, such as an ambient temperature correction amount, an exhaust temperature correction amount, an evaporator outlet temperature correction amount and the like, and the correction amounts enable the operating frequency of the outdoor unit to be additionally increased over the original techniques so as to ensure that the temperature regulation effect of the air conditioner is consistent with user settings. Therefore, when the outdoor unit sends out a low-voltage protection signal, the correction value for the indoor unit is removed, so that the operating frequency of the outdoor unit returns to the original operating frequency, and the speed of low-voltage fault removal can be accelerated. Meanwhile, after the low-voltage fault is eliminated, while the step of controlling the air conditioner to continuously operate is performed, the correction value for the indoor unit is restored, so that the temperature regulation effect of the air conditioner is guaranteed.
  • sensor error values such as an ambient temperature correction amount, an exhaust temperature correction amount, an evaporator outlet temperature correction amount and the like
  • the processor is preferably further used for: continuously acquiring the first protection accumulation value and the second protection accumulation value in a third preset time length; the first protection accumulation value reaching a first protection threshold value, and/or the second protection accumulation value reaching a second protection threshold value, controlling the air conditioner to stop operating and sending out prompt information.
  • the first protection accumulation value and the second protection accumulation value are continuously acquired within a third preset time length, and when the first protection accumulation value reaches the first protection threshold value and/or the second protection accumulation value reaches the second protection threshold value, the air conditioner is indicated to have too many times of low-voltage faults in a short time, and low-voltage protection signals are not false alarms caused by low starting capacity of the indoor unit. Therefore, the air conditioner is controlled to stop operating, fault prompt information is sent to a user to prompt the user that the air conditioner has a fault, and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel to go on door for maintenance at first time.
  • the processor is preferably further used for: adjusting an opening of the electronic expansion valve to an initial opening degree; or adjusting an opening of the electronic expansion valve to a maximum opening degree; or adjusting an opening of the electronic expansion valve to increase a preset opening degree.
  • the step of adjusting the opening degree of the electronic expansion valve specifically comprises adjusting the opening of the electronic expansion valve to the initial opening degree so as to enable the air conditioner to operate in an initial state; or the step of adjusting the opening degree of the electronic expansion valve is specifically to adjust the opening of the electronic expansion valve to the maximum opening degree, so that low-pressure faults can be eliminated at the fastest speed; or the step of adjusting the opening degree of the electronic expansion valve specifically comprises adjusting the electronic expansion valve to increase the preset opening degree, so that low-pressure faults can be automatically eliminated according to the preset step.
  • an air conditioner including the control device of an air conditioner as set forth in any one of the above technical solutions, and therefore, the air conditioner includes all the advantages of the control device of an air conditioner as set forth in any one of the above technical solutions.
  • FIG. 1 illustrates a flowchart of a control method of an air conditioner according to an embodiment of the present disclosure
  • FIG. 2 illustrates a flowchart of a control method of an air conditioner according to another embodiment of the present disclosure
  • FIG. 3 illustrates a flowchart of a control method of an air conditioner according to yet another embodiment of the present disclosure
  • FIG. 4 illustrates a flowchart of a control method of an air conditioner according to yet another embodiment of the present disclosure
  • FIG. 5 illustrates a flowchart of a control method of an air conditioner according to yet another embodiment of the present disclosure
  • FIG. 6 illustrates a flowchart of a control method of an air conditioner according to yet another embodiment of the present disclosure
  • FIG. 7 illustrates a flowchart of a control method of an air conditioner according to yet another embodiment of the present disclosure
  • FIG. 8 illustrates a flowchart of a control method of an air conditioner according to yet another embodiment of the present disclosure.
  • FIG. 9 illustrates a block diagram of a control device of an air conditioner according to an embodiment of the present disclosure.
  • FIGS. 1 to 9 A control method of an air conditioner, a control device of an air conditioner, and the air conditioner according to some embodiments of the present disclosure will be described with reference to FIGS. 1 to 9 .
  • a control method of an air conditioner including at least one indoor unit and one outdoor unit, the control method including:
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, so that the operating load of the air conditioner is lower, and the opening degree of the electronic expansion valve is lower.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, and a low-voltage protection signal of the outdoor unit of the air conditioner is received, the low-voltage protection signal has higher probability of false alarm caused by low operating load of the air conditioner and low opening degree of the electronic expansion valve.
  • the air conditioner is not controlled to stop and remove obstacles at the moment, but the opening degree of the electronic expansion valve is adjusted.
  • the refrigerant further fills the pipeline.
  • the low pressure of the outdoor unit rises to be higher than the low-pressure protection threshold value, low-pressure faults are eliminated, the outdoor unit does not send low-pressure protection signals, and the air conditioner can resume normal operation.
  • the technical solution provided in embodiments of the present disclosure when the starting capacity of the indoor unit is low, the shutdown of the air conditioner caused by the false alarm of a low-voltage protection signal due to the fact that the operating load of the air conditioner is low and the opening degree of the electronic expansion valve is low can be avoided, frequent false shutdown caused by the fact that the starting capacity of the indoor unit of the air conditioner is low is avoided, the reliability of the air conditioner can be effectively improved, and the comfort of a user for using the air conditioner is further improved.
  • the air conditioner when the air conditioner is started, whether the starting capacity of the indoor unit of the air conditioner is lower than or equal to a capacity threshold value is judged. If the starting capacity of the indoor unit is lower than or equal to the capacity threshold value, when a low-voltage protection signal of the outdoor unit is received, the electronic expansion valves of the indoor unit and the outdoor unit are controlled to increase the opening degree, the operating load of the air conditioner is increased, and the quantity of refrigerant passing through the electronic expansion valve is increased. When the refrigerant further fills the pipeline, the low-voltage fault of the outdoor unit is eliminated, the outdoor unit does not send a low-voltage protection signal, and the air conditioner is controlled to resume normal operation. Frequent shutdown of the air conditioner due to false alarm of the low-voltage protection signal is avoided, and the reliability of the air conditioner and the comfortableness of a user for using the air conditioner are improved.
  • control method of an air conditioner includes:
  • the timing is started after the opening degree of the electronic expansion valve is adjusted, and whether the low-voltage fault of the outdoor unit is eliminated or not is judged after the timing reaches a first preset time length; if the low-voltage fault of the outdoor unit is not eliminated, namely the low-voltage protection signal is still received, timing is continued, and waiting is performed for the refrigerant to further enter the pipeline; if the low-voltage fault of the outdoor unit is eliminated, a low-voltage protection signal is not received any more, indicating that the air conditioner can resume normal operation at the moment. 1 is added to the first protection accumulation value at the moment, the number of times that the fault takes a first preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • control method of an air conditioner includes:
  • the opening degree of the electronic expansion valve is adjusted and the timing reaches a first preset time length, but the low-voltage fault of the outdoor unit is not eliminated, and the timing is continued and reaches a second preset time length, whether the low-voltage fault of the outdoor unit is eliminated or not is judged again. If the low-voltage protection signal is still received at the moment, the low-voltage fault is not false alarm caused by low starting capacity of the indoor unit, so the air conditioner needs to be controlled to stop operating and send out prompt information.
  • the user is prompted that the air conditioner has a fault, and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel for door maintenance at first time; if the timing reaches the second preset time length, and the low-voltage fault of the outdoor unit is eliminated, the low-voltage protection signal is not received any more, and the air conditioner can resume normal operation at the moment. 1 is added to the second protection accumulation value at the moment, the number of times that the fault takes a second preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • control method of an air conditioner includes:
  • control method of an air conditioner includes:
  • control method of an air conditioner includes:
  • the first protection accumulation value and the second protection accumulation value are continuously acquired within a third preset time length.
  • the air conditioner is indicated to have too many times of low-voltage faults in a short time, and the low-voltage protection signal is not false alarm caused by the low starting capacity of the indoor unit. Therefore, the air conditioner is controlled to stop operating, fault prompt information is sent to a user to prompt the user that the air conditioner has a fault and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel to go on door for maintenance at first time.
  • the first protection threshold value is set to 3 and the second protection threshold value is set to 2.
  • the first protection accumulation value is greater than or equal to 3 and/or the second protection threshold value is greater than or equal to 2
  • the low-voltage protection of the air conditioner is stopped and cannot be automatically restored.
  • the step of adjusting the opening degree of the electronic expansion valve is as follows: adjusting an opening of the electronic expansion valve to an initial opening degree; or adjusting an opening of the electronic expansion valve to a maximum opening degree; or adjusting an opening of the electronic expansion valve to increase a preset opening degree.
  • the step of adjusting the opening degree of the electronic expansion valve specifically means to adjust the opening of the electronic expansion valve to the initial opening degree, so that the air conditioner operates in an initial state; or the step of adjusting the opening degree of the electronic expansion valve is specifically to adjust the opening of the electronic expansion valve to the maximum opening degree, so that low-pressure faults can be eliminated at the fastest speed; or the step of adjusting the opening degree of the electronic expansion valve specifically comprises adjusting the electronic expansion valve to increase the preset opening degree, so that low-pressure faults can be automatically eliminated according to the preset step.
  • control method of an air conditioner includes:
  • the opening degrees of the electronic expansion valves of the indoor unit and the outdoor unit are adjusted to the initial opening degree, and the current correction value for the indoor unit is removed. Timing is initiated. When the timing reaches a first preset time, whether a low-voltage protection signal is detected is judged again.
  • the air conditioner is controlled to continue to operate and recover the correction value for the indoor unit, and simultaneously 1 is added to the first protection accumulation value; when the judgment result is yes, the operating frequency of the outdoor unit is reduced and timing is continued; when the timing reaches a second preset time, whether a low-voltage protection signal is detected or not is judged again.
  • the air conditioner is controlled to continue to operate, the correction value for the indoor unit is restored, and meanwhile, the second protection accumulation value is increased by 1; and when the judgment result is yes, the air conditioner is controlled to stop operating and fault prompt information is sent out.
  • control method of an air conditioner includes:
  • the opening degrees of the electronic expansion valves of the indoor unit and the outdoor unit are adjusted to the initial opening degree, and the current correction value for the indoor unit is removed. Timing is initiated. When the timing reaches a first preset time, whether a low-voltage protection signal is detected is judged again.
  • the air conditioner is controlled to continue to operate and restore the correction value for the indoor unit, and simultaneously 1 is added to the first protection accumulation value; when the judgment result is yes, timing is continued; when the timing reaches a second preset time, whether a low-voltage protection signal is detected or not is judged again.
  • the air conditioner is controlled to continue to operate, the correction value for the indoor unit is restored, and meanwhile, the second protection accumulation value is increased by 1; and when the judgment result is yes, the air conditioner is controlled to stop operating and fault prompt information is sent out.
  • a control device 900 of an air conditioner including at least one indoor unit and one outdoor unit, the control device including: a memory 902 and a processor 904 ; the memory 902 being used for storing a computer program; the processor 904 being configured to execute the computer program to: when the starting capacity of the indoor unit is lower than or equal to the capacity threshold value and a low-voltage protection signal is received, adjust the opening degree of the electronic expansion valve.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, so that the operating load of the air conditioner is lower, and the opening degree of the electronic expansion valve is lower.
  • the starting capacity of the indoor unit of the air conditioner is lower than or equal to the capacity threshold value, and a low-voltage protection signal of the outdoor unit of the air conditioner is received, the low-voltage protection signal has higher probability of false alarm caused by low operating load of the air conditioner and low opening degree of the electronic expansion valve.
  • the air conditioner is not controlled to stop and remove obstacles at the moment, but the opening degree of the electronic expansion valve is adjusted.
  • the refrigerant further fills the pipeline.
  • the low pressure of the outdoor unit rises to be higher than the low-pressure protection threshold value, low-pressure faults are eliminated, the outdoor unit does not send low-pressure protection signals, and the air conditioner can resume normal operation.
  • the technical solution provided in embodiments of the present disclosure when the starting capacity of the indoor unit is low, the shutdown of the air conditioner caused by the false alarm of a low-voltage protection signal due to the fact that the operating load of the air conditioner is low and the opening degree of the electronic expansion valve is low can be avoided, the frequent false shutdown caused by the fact that the starting capacity of the indoor unit of the air conditioner is low is avoided, the reliability of the air conditioner can be effectively improved, and the comfort of a user for using the air conditioner is further improved.
  • the processor is preferably further configured to: after the opening degree of the electronic expansion valve is adjusted, start timing; when the timing reaches a first preset time length, if a low-voltage protection signal is still received, continue timing; otherwise, control the first protection accumulation value to be increased by 1, and control the air conditioner to continue to operate.
  • the timing is started after the opening degree of the electronic expansion valve is adjusted, and whether the low-voltage fault of the outdoor unit is eliminated or not is judged after the timing reaches a first preset time length; if the low-voltage fault of the outdoor unit is not eliminated, namely the low-voltage protection signal is still received, timing is continued, and waiting is performed for the refrigerant to further enter the pipeline; if the low-voltage fault of the outdoor unit is eliminated, a low-voltage protection signal is not received any more, indicating that the air conditioner can resume normal operation at the moment. 1 is added to the first protection accumulation value at the moment, the number of times that the fault takes a first preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • the processor is preferably further configured to: when the timing reaches a second preset time length, if the low-voltage protection signal is still received, control the air conditioner to stop operating and send out prompt information; otherwise, control the second protection accumulation value to be increased by 1, and control the air conditioner to continue to operate.
  • the timing is continued and reaches a second preset time length. Whether the low-voltage fault of the outdoor unit is eliminated or not is judged again, and if the low-voltage protection signal is still received at the moment, the low-voltage fault is not false alarm caused by low starting capacity of the indoor unit, so the air conditioner needs to be controlled to stop operating and send out prompt information.
  • the user is prompted that the air conditioner has a fault, and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel for door maintenance at first time; if the timing reaches the second preset time length, the low-voltage fault of the outdoor unit is eliminated, and the low-voltage protection signal is not received any more, the air conditioner can resume normal operation at the moment. 1 is added to the second protection accumulation value at the moment, the number of times that the fault takes a second preset time length and then resumes normal operation are recorded, and the air conditioner is controlled to continue to operate.
  • the processor is preferably further configured to: reduce operating frequency of the outdoor unit.
  • the processor is preferably further configured to: in the step of adjusting the opening degree of the electronic expansion valve, simultaneously, remove the correction value for the indoor unit; and restore the correction value for the indoor unit in the step of controlling the air conditioner to continue to operate.
  • the processor is preferably further configured to: continuously acquire the first protection accumulation value and the second protection accumulation value within a third preset time length; when the first protection accumulation value reaches the first protection threshold value and/or the second protection accumulation value reaches the second protection threshold value, control the air conditioner to stop operating and send out prompt information.
  • the first protection accumulation value and the second protection accumulation value are continuously acquired within the third preset time length.
  • the air conditioner is indicated to have too many times of low-voltage faults in a short time, and the low-voltage protection signal is not false alarm caused by the low starting capability of the indoor unit. Therefore, the air conditioner is controlled to stop operating, and fault prompt information is sent to a user to prompt the user that the air conditioner has a fault and the fault cannot be automatically eliminated, so that the user contacts maintenance personnel to go on door for maintenance at the first time.
  • the processor is preferably further configured to: adjust the opening of the electronic expansion valve to an initial opening degree; or adjust an opening of the electronic expansion valve to a maximum opening degree; or adjust an opening of the electronic expansion valve to increase a preset opening degree.
  • the step of adjusting the opening degree of the electronic expansion valve specifically means to adjust the opening of the electronic expansion valve to the initial opening degree, so that the air conditioner operates in an initial state; or the step of adjusting the opening degree of the electronic expansion valve is specifically to adjust the opening of the electronic expansion valve to the maximum opening degree, so that low-pressure faults can be eliminated at the fastest speed; or the step of adjusting the opening degree of the electronic expansion valve specifically comprises adjusting the electronic expansion valve to increase the preset opening degree, so that low-pressure faults can be automatically eliminated according to the preset step.
  • an air conditioner including the control device of an air conditioner as described in any of the above embodiments, and therefore, the air conditioner includes all the advantages of the control device of an air conditioner as described in any of the above embodiments.
  • the term “plurality” refers to two or more, unless explicitly defined otherwise.
  • the orientation or positional relationship indicated by the terms “upper”, “lower”, and the like is based on the orientation or positional relationship shown in the drawings, merely for convenience in describing the present disclosure and simplifying the description, and does not indicate or imply that the referenced device or element must have a particular orientation, or must be constructed and operative in a particular orientation. Therefore, they should not be construed as limiting the present disclosure.
  • the terms “connected”, “mounted”, “fixed”, and the like are to be construed broadly, e.g., “connected” may refer to a fixed connection, or may refer to a detachable connection, or an integral connection. They may be connected directly or indirectly through an intermediary. The specific meaning of the above terms in this application will be understood by those of ordinary skill in the art, as the case may be.
  • the description of the terms “an embodiment”, “some embodiments”, “particular embodiments”, etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure.
  • the schematic representation of the above terms does not necessarily refer to the same embodiment or example.
  • the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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